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  1. // set an outer proposed boundary for parent object(s)
  2. // allows the ray-tracer to do a quick check on the BoundingShape,
  3. // and if outside, it skips checking this object.  Note that this
  4. // is not a 100% guaranteed clipping shape... use the
  5. // clipped_by statement for that.
  6. bounded_by { box { -(x+y+z) +(x+y+z) }
  7.